Comparison

Window vs Fastin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Window

This app helps you adopt an intermittent fasting lifestyle with science-based guidance and personalized recommendations. Track your fasting and eating periods, monitor weight loss goals, and stay hydrated. Access expert insights and challenges to build healthier habits.

Highlights
  • Fasting timer
  • Weight journal
  • Water tracker
  • Personalized fasting programs
  • Meal plans
  • Healthy challenges
Features
Read full description

Take the step towards a healthier you with Window, your in-hand intermittent fasting companion. We use a science-based approach, guided by experts, and offer personalized recommendations suited to you and your lifestyle! Intermittent fasting is a popular eating pattern that can help you lose weight and feel healthier. Window will help you do it confidently – the right way. Track your fasting and eating, set weight loss goals and monitor them, track your water consumption, and get healthy insights from nutritionists. Window has everything you need (and more) to create a healthier lifestyle! ** What you will get as a FREE Window user ** • Fasting timer – Track your fasting and eating periods. • Timely reminders – Get notifications when your fasting windows close or open. • Weight journal – Set your weight goal, and monitor the progress. • Water tracker – Control your hydration level. • Healthy blog – Learn from leading nutritionists, and get insights on health, eating, and body – and how they all relate. • Syncs with your Apple Watch. • Syncs with Apple Health. ** Join Window PREMIUM to access: ** • Personalized fasting program. • All intermittent fasting plans – Switch between fasting plans to meet your current needs. • Your individual meal plan – Get nutritionists’ recommendations of what to eat for breakfast, lunch, and dinner. • Personal statistics – Track your own statistics like weight, water intake, and more. • Healthy challenges – Build new habits, like consuming less sugar, with small tasks. • Nutrition and mood tracker – Understand how fasting influences your body and mind. Whether you want to improve your eating habits or lose a little weight, we will help you stay on track and provide all of the support and guidance you may need. * SUBSCRIPTION INFORMATION Subscription payments will be charged to your App Store account at confirmation of your purchase. Subscriptions will automatically renew and you will be charged unless auto-renew is turned off or unless you cancel at least 24 hours prior to the end of the current subscription or trial period. Any unused portion of a free trial period will be forfeited when you purchase a premium subscription during the free trial period. The cost of renewal depends on the Subscription Plan you choose. Subscriptions and auto-renewal may be managed by going to Account Settings after purchase or by contacting Customer Support. Window is intended to be a tool to track intermittent fasting and is not a medical or healthcare service. The content within Window is for informational purposes only. You should consult with a medical professional before starting intermittent fasting or any other weight loss program, especially if you are pregnant or suffer from a medical condition. Happy tracking! Icons powered by icons8.com ThrivePort, LLC is a part of the Apalon family of brands. See more at Apalon.com. By using Window you agree to our Terms of Service and Privacy Policy. Privacy Policy: http://www.thriveport.com/privacypolicy/ EULA: http://www.thriveport.com/eula/ AdChoices: http://www.thriveport.com/privacypolicy/#4 California Privacy Notice: http://www.thriveport.com/privacypolicy/index.html#h

About

Fastin

This app guides you through intermittent fasting for weight loss and improved health. It offers personalized plans, tracking tools for food, weight, water, sleep, and activity, along with educational courses on fasting and nutrition. Visualize your progress with detailed statistics to stay motivated on your journey.

Highlights
  • Personalized fasting plans
  • Food, weight, water, sleep, and activity tracking
  • Fasting and nutrition courses
  • Progress statistics and charts
  • Step-by-step fasting guidance
  • Meal journal for mindful eating
Features
Read full description

Do you know how to lose weight and keep it for a lifetime? We have no way to exercise for 3 hours a day, weigh food, and count calories anytime. But we can control when to eat to Lose Weight which is FASTING. All you need to do is shift eating time to lose weight. The most popular and healthy way to lose weight from our wise ancients. Let’s guide you on how to start your fasting journey. Fastin: Intermittent Fasting is a simple fasting app, a powerful weight-loss tool. Lose weight, improve your health and simplify your lifestyle. Intermittent fasting has a powerful effect on your body and brain and may help you live a longer, healthier life. Intermittent fasting(IF) doesn’t specify which foods you should eat, but rather when you should eat them. Learn the science behind intermittent fasting(IF) so you can use it to achieve your goals. LIVE LONGER & LOOK BETTER HOW WE HELP YOU MASTER INTERMITTENT FASTING Fasting guidance A step-by-step guide to intermittent fasting Smart and flexible tracking tools that adapt to your needs Body status shows you what’s happening to your body when fasting Personalized fasting plans based on your body condition (6 plans available) Fasting Tools Food Tracker: log every meal and snack, view food values and trends and gain insights into our nutrition course Weight Tracker: record weight changes to reach your ideal weight Water Tracker: track consumption and stay hydrated Sleep tracker: aim to sleep to lose more weight Activity Tracker: track daily activity and motivate yourself to move a little more Reminders: hit every mini-goal to reach your dream target Fasting & Nutrition Courses Knowledge library for intermittent fasting and nutrition Professional content on nutrition, learn to choose the right foods Easy-to-use meal journal for mindful eating Boost your immune system, become stronger than ever Fasting Statistics(For insights & motivation) Visualize your fasting process and track changes in charts Reveal the patterns of your fasting process and body performance Find physiological harmony - Intermittent fasting connects body, mind & soul with your weight Get inspiring and self-reflective statistics - stay motivated. DISCLAIMER Intermittent fasting is a change in eating habits. It is not suitable for pregnant/nursing women, children under 18 years of age, or people with diagnosed eating disorders. Consult your doctor or health care professional. *Individual results may vary, and testimonials are not claimed to represent typical results. HEALTH APP INTEGRATION: Fastin: Intermittent Fasting - Simple Fasting App integrates with Apple Health App so you can sync your data (requires iOS 9 and above). Fastin: Intermittent Fasting also supports Face ID for security. SUBSCRIPTION POLICY Get full access to all the features and your personalized fasting plan including a nutrition guide in the Fastin: Intermittent Fasting app with an in-app purchase. Plans: $6.99 Weekly, $19.99 Quarterly Payment: Payment will be charged to your Apple account on confirmation of purchase Cancellation: Manage at your Apple Account Settings Renewal: Account will be charged for renewal 24-hours before the end of the current period TERMS & POLICY Privacy: https://s.bongmi.cn/miscs/fasting-app/en/privacy.html Service: https://s.bongmi.cn/miscs/fasting-app/en/service.html Download Fastin: Intermittent Fasting - Simple Fasting App to help you reach your goals faster and more effectively! Establish a basic eating discipline, keep yourself in good shape during self-isolation and use our educational and motivational content to stay mindful of your eating habits. Our mission is not only to offer you an Intermittent Fasting App, but also to improve your health, increase weight loss, and improve cognitive ability. Download Intermittent Fasting Tracker now. Start your new journey today!

Screenshots

Window4 screens
Fastin4 screens

Verdict

The call

The clearest difference is monetization model: Window at freemium against Fastin's subscription. Window also leads on device support (4 vs 2) and iOS requirement (14.0 vs 16.6). Fastin's advantage is rating (4.8 vs 4.5) and review sentiment (33% vs 22%). On price, ratings volume, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Window sells 16 in-app purchases, starting at $0.49 per year and Fastin sells 10 in-app purchases, starting at $4.49 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Fastin holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 11K and 10K respectively. Written reviews point the same way: 22% of Window's written reviews are positive against 33% of Fastin's.

UpkeepUpdate frequency

Window ships an update monthly, Fastin every 3 weeks. Both last shipped on October 30, 2026.

Scorecard5 real differences · 5 level
Window versus Fastin: the parameters behind the verdict, then further details
ParameterWindowFastin
PriceFreeFree
Rating4.5 (11K ratings)4.8 (10K ratings) — better
Positive reviews22.0% of reviews33.3% of reviews — better
Number of ratings11K — better10K
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterSubscription
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS14.0 — better16.6
Further details — not scored
Size131 MB243 MB
Age rating17+17+
DeveloperMosaic S.r.l.Bongmi Global Group

Customer experience

Window

All ratings10,601 ratings
Positive88.0%
Neutral4.7%
Negative7.3%
Written reviews952 reviews
Positive22.0%
Neutral9.0%
Negative69.0%

Fastin

All ratings10,157 ratings
Positive96.3%
Neutral1.2%
Negative2.5%
Written reviews294 reviews
Positive33.3%
Neutral5.8%
Negative60.9%

User reviews

Window

From 11K App Store ratings

What we love

  • 🚀 Easy to use
  • 📊 Helpful data tracking
  • 🔍 Comprehensive features
  • 👍 Flexible fasting options
  • 💪 Motivating for fasting

Room to improve

  • 🐛 Sync issues across devices
  • 🕰️ Inconsistent time tracking
  • 💰 Expensive subscription
  • 🔍 Confusing interface changes
  • 🔧 Unreliable app functionality

Fastin

From 10K App Store ratings

What we love

  • ⭐ Excellent app
  • 👍 Easy to use
  • 🔍 Helpful for weight loss
  • 🔍 Motivational
  • 🔍 Informative

Room to improve

  • 💰 Paid subscription required
  • 🔍 Limited food database
  • 🔍 Inaccurate calorie tracking
  • 🔍 Confusing or unintuitive interface
  • 🐛 Bugs and glitches

Bugs and requests

Window

Reported bugs

5 issues
  • Fasting times not accurately recorded
  • Data loss and reset issues
  • Subscription management problems
  • Frequent app crashes and freezes
  • Notifications not working as expected

Requested features

5 requests
  • Ability to edit fasting/eating times
  • Integration with fitness trackers
  • More detailed data analysis and reporting
  • Customizable fasting plans and reminders
  • Better support for longer fasting periods

Fastin

Reported bugs

4 issues
  • Fasting timer resets unexpectedly
  • App crashes or freezes
  • Sync and login issues
  • Inability to edit past fasts

Requested features

6 requests
  • Ability to scan barcodes for nutrition info
  • More recipes and meal planning options
  • Integration with fitness trackers
  • Customizable fasting schedules
  • Better data tracking and analysis
Show 1 more
  • Improved customer support

In-app purchases

16 purchases

Window

Subscriptions16
  • Window Premium (1 Year)1 Year trial$0.491 Year
  • Window Pro Weekly$4.997 Days
  • Window Pro Weekly7 Days trial$4.997 Days
Show 13 more
  • Window Premium (1 Year)$11.991 Year
  • Window Premium (1 Month)$14.991 Month
  • Window Premium (3 Months)3 variants$19.993 Months
  • Window Premium (1 Year)$24.991 Year
  • Window Premium (1 Year)7 Days trial$39.991 Year
  • Window Premium (1 Year)7 Days trial$49.991 Year
  • Window Premium (1 Year)14 Days trial$49.991 Year
  • Window Premium (1 Year)7 Days trial$54.991 Year
  • Window Premium (1 Year)2 variants$59.991 Year
  • Window Premium (1 Year)$69.991 Year
  • Window Premium (1 Year)$79.991 Year
  • Window Premium (1 Year)7 Days trial$89.991 Year
  • Window Premium (1 Year)7 Days trial$99.991 Year
10 purchases

Fastin

Subscriptions10
  • FastingPrime1Weekly3 Days trial$4.497 Days
  • PrimeWeekly$6.997 Days
  • Fasting Prime3 Days trial$6.997 Days
Show 7 more
  • PrimeMonthly2 variants$9.991 Month
  • PrimeWeekly$9.997 Days
  • Fasting Prime3 Days trial$9.991 Month
  • PrimeQuarterly2 variants$19.993 Months
  • Fasting Prime7 Days trial$29.991 Year
  • PrimeQuarterly$29.993 Months
  • PrimeYearly$49.991 Year

Questions

Is Window free?
Window is free to download, with in-app purchases available.
Is Fastin free?
Fastin is free to download, with in-app purchases available.
Which has better reviews, Window or Fastin?
Fastin is rated higher. Window averages 4.5 out of 5 from 11K ratings, while Fastin averages 4.8 from 10K ratings.
Do Window or Fastin have ads?
Neither Window nor Fastin shows ads.
Which is updated more often, Window or Fastin?
Window ships an update monthly, and Fastin every 3 weeks. Most recently, Window was updated on October 30, 2026 and Fastin on October 30, 2026.

Other comparisons